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When you spot someone and they wave and you wave back and you end up having lunch and laughing and then you kill each other.
I saw my ex at the burger place. We waved. We had lunch. Now we're both dead.
My mom saw my dad at the grocery store. They said hi. They had coffee. Now they're both in the hospital.
I saw my teacher at the mall. We said hi. We got ice cream. Now we're both dead.